1. Open the Ocho app on your mobile device and choose your preferred game mode: Classic or Team mode.

2. In Classic mode, select the number of players (from 2 to 8). In Team mode, choose a team format such as 2vs2, 3vs3, 4vs4, or 6vs6.

3. Once the game begins, each player is dealt a hand of cards. Your goal is to be the first to play all your cards.

4. On your turn, play a card that matches the top card on the discard pile by number or color.

5. If you do not have a matching card, draw one from the draw pile. If the drawn card is playable, you can play it immediately.

6. Special cards like skips, reverses, and draw twos affect gameplay and can be used strategically.

7. There is no need to declare "UNO" when you have one card left, making gameplay faster and smoother.

8. Team mode allows you to cooperate with teammates to help your team win by being the first to empty all team members' hands.

9. Tap a card in your hand to select it. The game supports both Portrait and Landscape orientations for comfortable play.

10. Continue playing turns until one player (or team) plays their last card and wins the game.